System and method for communication using orbital angular momentum with multiple layer overlay modulation

• US 9,712,238 B2
• Filed: 11/21/2016
• Issued: 07/18/2017
• Est. Priority Date: 04/04/2014
• Status: Active Grant

• Current Assignee: Nxgen Partners Ip, LLC (NxGen Partners LLC)
• Original Assignee: Nxgen Partners Ip, LLC (NxGen Partners LLC)
• Inventors: Ashrafi, Solyman, Linquist, Roger, Ashrafi, Nima
• Primary Examiner(s): Okeke, Izunna
• Application Number:
  US15/357,808
• Publication Number:
  US 20170070290A1
• Time in Patent Office: 239 Days
• CPC Class Codes: H04B 10/11 Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
• CPC Class Codes: H04B 10/2575 Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
• CPC Class Codes: H04B 10/2581 Multimode transmission
• CPC Class Codes: H04B 10/50 Transmitters
• CPC Class Codes: H04B 10/5161 Combination of different modulation schemes
• CPC Class Codes: H04B 10/532 Polarisation modulation
• CPC Class Codes: H04B 10/541 Digital intensity or amplitude modulation
• CPC Class Codes: H04J 14/00 Optical multiplex systems
• CPC Class Codes: H04J 14/06 Polarisation multiplex systems
• CPC Class Codes: H04L 2025/0335 characterised by the type of transmission
• CPC Class Codes: H04L 2025/0342 QAM
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 27/3405 Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
• CPC Class Codes: H04L 27/362 Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence
• CPC Class Codes: H04L 27/366 Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
• CPC Class Codes: H04L 63/06 for supporting key management in a packet data network cryptographic mechanisms or cryptographic arrangements for key management H04L9/08
• CPC Class Codes: H04L 9/0858 Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
• CPC Class Codes: H04L 9/3093 involving Lattices or polynomial equations, e.g. NTRU scheme
• CPC Class Codes: H04W 12/041 Key generation or derivation
• CPC Class Codes: H04W 12/0431 : Key distribution or pre-distribution; Key agreement

Abstract

A communications system includes RF processing circuitry for receiving a plurality of data streams and processing the plurality of data streams to associate with each of the plurality of data streams an orthogonal function to cause each of the plurality of data streams to be mutually orthogonal to each other on an RF link to enable transmission of each of the plurality of data streams on the RF link at a same time. Optical processing circuitry receives the plurality of data streams and processes the plurality of data streams to associate with each of the plurality of data streams the orthogonal function to cause each of the plurality of data streams to be mutually orthogonal to each other on an optical link to enable transmission of each of the plurality of data streams on the optical link at a same time. Switching circuitry multiplexes between the RF link and the optical link responsive to operating conditions on the RF link and the optical link.

Claims

1. A communications system, comprising:

RF processing circuitry for receiving a plurality of data streams and processing the plurality of data streams to associate with each of the plurality of data streams an orthogonal function to cause each of the plurality of data streams to be mutually orthogonal to each other on an RF link to enable transmission of each of the plurality of data streams on the RF link at a same time, wherein the orthogonal function comprises at least one of a Hermite-Gaussian function, a Laguerre-Gaussian function, a Jacobi polynomial, a Gegenbauer polynomial, a Legendre polynomial, a Chebyshev polynomial, a Q-function, a time-limited and bandwidth-limited function, a rectangular function, a cylindrical function and a spherical function;

optical processing circuitry for receiving the plurality of data streams and processing the plurality of data streams to associate with each of the plurality of data streams the orthogonal function to cause each of the plurality of data streams to be mutually orthogonal to each other on an optical link to enable transmission of each of the plurality of data streams on the optical link at a same time;

switching circuitry for multiplexing between the RF link and the optical link responsive to operating conditions on the RF link and the optical link;

a signal separator for separating the plurality of data streams having different orthogonal functions applied thereto from each other that are received over the RF link or the optical link;

second RF processing circuitry for processing data received over the RF link to remove the orthogonal function from each of the plurality of data streams received together over the RF link;

second optical processing circuitry for processing data received over the optical link to remove the orthogonal function from each of the plurality of data streams received together over the optical link; and

second switching circuitry for switching between the second RF processing circuitry and the second optical processing circuitry responsive to the operating conditions on the RF link and the optical link.

2. The communications system of claim 1, wherein the operating conditions comprise at least one of atmospheric disturbances and scintillation.

3. The communications system of claim 1, wherein the operating conditions comprise channel impairments detected using at least one of a control or pilot channel.

4. The communications system of claim 3 further comprising a closed loop control system for correcting detected channel impairments using algorithmic techniques.

5. The communications system of claim 1 further comprising a housing containing the RF processing circuitry, the optical processing circuitry and the switching circuitry.

6. The communications system of claim 1 further comprising modulation circuitry for applying multilayer overlay modulation to the plurality of data streams prior to association of the orthogonal function.

7. The communications system of claim 1, wherein the switching circuitry multiplexes between the RF processing circuitry and the optical processing circuitry in real time during transmission of the plurality of data signals.

8. A method for transmitting a plurality of input streams, comprising:

receiving a plurality of data streams at RF processing circuitry;

processing, at the RF processing circuitry the plurality of data streams to associate with each of the plurality of data streams an orthogonal function to cause each of the plurality of data streams to be mutually orthogonal to each other on an RF link to enable transmission of each of the plurality of data streams on the RF link at a same time, wherein the orthogonal function comprises at least one of a Hermite-Gaussian function, a Laguerre-Gaussian function, a Jacobi polynomial, a Gegenbauer polynomial, a Legendre polynomial, a Chebyshev polynomial, a Q-function, a time-limited and bandwidth-limited function, a rectangular function, a cylindrical function and a spherical function;

receiving the plurality of data streams at optical processing circuitry;

processing, at the optical processing circuitry, the plurality of data streams to associate with each of the plurality of data streams the orthogonal function to cause each of the plurality of data streams to be mutually orthogonal to each other on an optical link to enable transmission of each of the plurality of data streams on the optical link at a same time;

switching transmissions of the plurality of data between the RF link and the optical link responsive to operating conditions on the RF link and the optical link;

receiving the plurality of data streams over the RF link or the optical link;

separating the plurality of data streams having different orthogonal functions applied thereto from each other that are received over the RF link or the optical link;

processing, using second RF processing circuitry, data received over the RF link to remove the orthogonal function from each of the plurality of data streams received together over the RF link;

processing, using second optical processing circuitry, data received over the optical link to remove the orthogonal function from each of the plurality of data streams received together over the optical link; and

switching between the second RF processing circuitry and the second optical processing circuitry responsive to the operating conditions on the RF link and the optical link.

9. The method of claim 8, wherein the operating conditions comprise at least one of atmospheric disturbances and scintillation.

10. The method of claim 8, wherein the operating conditions comprise channel impairments detected using at least one of a control or pilot channel.

11. The method of claim 10 further comprising correcting detected channel impairments using algorithmic techniques through a closed loop system.

12. The method of claim 8 further comprising applying multilayer overlay modulation to the plurality of data streams prior to association of the orthogonal function.

13. The method of claim 8, wherein the step of switching further comprises switching between the RF processing circuitry and the optical processing circuitry in real time during transmission of the plurality of data signals.